CVE-2026-78437
tomcat9: Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause...
CVE-2026-78437 is fixed in 27 products on 1 platform, first by DEBIAN-CVE-2026-78437, released September 24, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.3
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0051
43rd percentile
Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libtcnative-1-0 · opensuse-leap 16.0 | 1.3.9-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| libtcnative-1-0 · sles 15.6 | 1.3.9-150600.16.9.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| libtcnative-1-0 · sles 15.7 | 1.3.9-150600.16.9.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| libtcnative-1-0 · sles 16.0 | 1.3.9-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| libtcnative-2-0 · opensuse-leap 16.0 | 2.0.16-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| libtcnative-2-0 · sles 16.0 | 2.0.16-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat · opensuse-leap 16.0 | 9.0.122-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| tomcat · sles 15.6 | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat · sles 15.7 | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat · sles 16.0 | 9.0.122-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat10 · Debian 14 | 10.1.60-1 | DEBIAN-CVE-2026-78437 | Sep 24, 2026 |
| tomcat10 · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10 · opensuse-leap 16.0 | 10.1.60-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| tomcat10 · sles 15.6 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat10 · sles 15.7 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat10 · sles 16.0 | 10.1.60-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat10-admin-webapps · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-docs-webapp · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-el-5.0-api · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-jsp-3.1-api · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-lib · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-servlet-6.0-api · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-webapps · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat11 · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11 · opensuse-leap 16.0 | 11.0.26-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| tomcat11 · sles 15.6 | 11.0.26-150600.13.36.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| tomcat11 · sles 15.7 | 11.0.26-150600.13.36.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| tomcat11 · sles 16.0 | 11.0.26-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat11-admin-webapps · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-docs-webapp · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-el-6.0-api · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-jsp-4.0-api · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-lib · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-servlet-6.1-api · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-webapps · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat9 · Debian 12.15 (bookworm) | 9.0.70-2 | DEBIAN-CVE-2026-78437 | Sep 24, 2026 |
| tomcat9 · Debian 13.5 (trixie) | 9.0.70-2 | DEBIAN-CVE-2026-78437 | Sep 24, 2026 |
| tomcat9 · Debian 14 | 9.0.70-2 | DEBIAN-CVE-2026-78437 | Sep 24, 2026 |
| tomcat9 · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-admin-webapps · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-docs-webapp · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-el-3.0-api · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-jsp-2.3-api · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-lib · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-servlet-4.0-api · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-webapps · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
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